SUSPENDED BOREHOLE TAMPING Russian patent published in 2010 - IPC F42D1/08 

FIELD: mining.

SUBSTANCE: proposed borehole tamping represents a cylinder with diametre commensurable with borehole diametre. Said solid cylinder is accommodated in the borehole at the depth of mass with intensive fracturing. Note here that cylinder top face is skewed and secured by ropes to crossarm arranged above borehole head. Cylinder skewed part top has a cut made parallel to bottom face with width making 0.1-0.2 diametre of tampering wherein one or several rods extended above them by 1-1.5 cm. Below skewed part bottom and perpendicular to borehole wall, one or several rods are arranged to extend above them by 1-1.5 cm. End of two ropes are secured to face skewed part at 2-3 cm from tamping edges. Note that one rope is secured nearby edge of tamping skewed part, while another end is secured to bottom edge.

EFFECT: intensified rock crushing, reduced consumption of explosive, lower costs.

2 dwg